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What is the reason not to use select *?
...tle differently. Brittle is normally defined as 'breaks easily'. Having unknown or hard-to-find dependencies because each piece of code will use different columns means I can't easily change anything at the data level without full regression .. which seems brittle.
– Robert Pau...
How can I list ALL DNS records?
...nswer "${3:-any}"
else
dig +nocmd "$1" +noall +answer "${2:-any}"
fi
Now I use dg example.com to get a nice, clean list of DNS records, or dg example.com x to include a bunch of other popular subdomains.
grep -vE "${wild_ips}" filters out records that could be the result of a wildcard DNS ent...
Returning a C string from a function
...ing like "my string" actually uses 9+1 (=10!) bytes. This is important to know when you finally get around to allocating strings dynamically.
So, without this 'terminating zero', you don't have a string. You have an array of characters (also called a buffer) hanging around in memory.
Longevity of ...
Why is Magento so slow? [closed]
...ply the DB writes stalling due to some badly written SQL, but I do realise now that there is much more going on behind the scenes that initially expected. As a note: caching was disabled due to products being added by the shop owner. When cache was on he complained of products not appearing forcing ...
How do JavaScript closures work?
How would you explain JavaScript closures to someone with a knowledge of the concepts they consist of (for example functions, variables and the like), but does not understand closures themselves?
...
What's the $unwind operator in MongoDB?
...s.funded_year"
} }
])
If we look at the funding_rounds array, we know that for each funding_rounds, there is a raised_amount and a funded_year field. So, unwind will for each one of the documents that are elements of the funding_rounds array produce an output document. Now, in this example,...
MySQL COUNT DISTINCT
... countVisits
, site_id As site
From cp_visits
Where ts >= DATE_SUB(NOW(), INTERVAL 1 DAY)
Group By site_id
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How to initialize an array's length in JavaScript?
...(function () {}) gives you an array with length 5 and undefined as values, now it can be iterated over.
Array.apply(null, Array(5)).map(function (x, i) { return i; }) gives you an array with length 5 and values 0,1,2,3,4.
Array(5).forEach(alert) does nothing, Array.apply(null, Array(5)).forEach(aler...
Illegal string offset Warning PHP
...ort"]=> string(5) "11211" } string(5) "m_prefix" PHP 5.4 now $xx['host'] threw the warning correctly.
– thesonix
Mar 26 '12 at 9:17
...
How to implement the Android ActionBar back button?
...ress the back button. This should be done in the AndroidManifest.xml too.
Now you can enable the back button in the onCreate method of your "child" activity.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setDisplayHomeAsUp...